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<h1>购买云服务器</h1>
<p>每个云服务商都提供云服务器，经常称为ECS</p>
<ol>
<li>硬件建议：1CPU  1GB内存</li>
<li>镜像： CentOS 7.4</li>
<li>
网络：
<ul>
<li>分配公网 IP，用于远程访问</li>
<li>安全组（防火墙），开启22端口，用于远程访问</li>
</ul>
</li>
<li>
登录凭证：
<ol>
<li>使用root和密码登录</li>
<li>主机名：demo</li>
</ol>
</li>
<li>购买时长： 一周可以，土豪随意</li>
</ol>
<h1>ssh 远程登录命令</h1>
<p>特点：</p>
<ol>
<li>ssh 是加密通讯，通讯过程不会被任何人监听。</li>
<li>服务器端必须开始sshd进程，监听tcp 22端口</li>
<li>客户端使用 ssh 连接到服务器22端口</li>
<li>
第一次通讯必须先确认接受证书，才能进行远程登录
<ol>
<li>证书保存在客户端的 ~/.ssh 文件夹</li>
</ol>
</li>
<li>ssh 用于远程操作操作服务器</li>
<li>ssh 包含 sftp 功能，可以远程传递文件。</li>
</ol>
<h1>搭建Java环境</h1>
<ol>
<li>
<p>下载JDKjdk-8u191-linux-x64.tar.gz</p>
</li>
<li>
<p>上载到服务器</p>
<h2>- sftp 上载</h2>
</li>
<li>
<p>安装到合适位置</p>
<ol>
<li>
<p>释放压缩包 jdk1.8.0_161</p>
</li>
<li>
<p>一般要安装到 /usr/local</p>
<p>cd
su
mv jdk1.8.0_161 /usr/local </p>
</li>
<li>
<p>修改文件的执行权限（可选操作）</p>
<p>cd /usr/local/jdk1.8.0_161/bin
chmod +x *</p>
</li>
</ol>
</li>
<li>
<p>修改profile文件，配置环境变量</p>
<p>export JAVA<em>HOME=/usr/local/jdk1.8.0</em>161
export CLASSPATH=.
export PATH=$JAVA_HOME/bin:$PATH	</p>
</li>
<li>
<p>验证</p>
<p>java -version
javac -version
javac HelloWorld.java
java HelloWorld</p>
</li>
</ol>
<h1>JDK 目录结构</h1>
<pre><code>/usr/local/jdk1.8.0_161
|- bin    JDK 开发工具： java，javac，jar等命令
|   |- javac
|   |- java
|   |- jar 
|   |- ...
|- lib
|   |- tools.jar   开发工具的实现类
|- jre      Java 运行环境
|   |- bin    Java 虚拟机
|   |- lib 
|   |   |- rt.jar  Java API 类
</code></pre>

<h1>设置Java环境变量</h1>
<pre><code>JAVA_HOME=JDK安装目录
PATH=将JDK安装目录的bin扩展到PATH
CLASSPATH=.
</code></pre>

<p>案例:</p>
<pre><code>export JAVA_HOME=/usr/local/jdk1.8.0_161
export CLASSPATH=.
export PATH=$JAVA_HOME/bin:$PATH
</code></pre>

<h2>PATH 的变量意义</h2>
<p>PATH：操作系统“可执行命令”的搜索路径。</p>
<p>可执行命令： unzip  who  whoami witch等都是系统命令</p>
<p>将Java安装目录的bin文件夹设置到 PATH 变量中，可以达到为Linux扩展Java的工具命令作用。</p>
<p>案例：</p>
<pre><code>检查 
which who
which java
java -version
export PATH=/usr/local/jdk1.8.0_161/bin:$PATH
检查
which who
which java
java -version   
</code></pre>

<h2>profile 文件</h2>
<p>系统初始化脚本文件。</p>
<p>Linux、Unix（Mac）在启动过程中会执行一系列动作。在这个动作中会执行 /etc/profile 中登记的全部指令。</p>
<p>如果将指令（操作系统命令）写到profile文件中，则每次启动期间都会执行这个指令。</p>
<p>经常利用profile设置系统级别的环境参数，比如Java环境变量的配置。</p>
<h1>安装Tomcat</h1>
<ol>
<li>下载Tomcat</li>
<li>上载到服务器</li>
<li>释放配置</li>
</ol>
<p>zip版本</p>
<pre><code>wget http://doc.tedu.cn/resource/apache-tomcat-8.0.50.zip
unzip apache-tomcat-8.0.50.zip
cd apache-tomcat-8.0.50
cd bin
chmod +x *.sh
cd ../../
mv apache-tomcat-8.0.50 /usr/local
cd /usr/local/apache-tomcat-8.0.50/bin
./startup.sh
ps -A|grep java

firewall-cmd --permanent --add-port=8080/tcp
firewall-cmd --reload
</code></pre>

<p>tar.gz 版本</p>
<pre><code>wget http://mirrors.shu.edu.cn/apache/tomcat/tomcat-8/v8.5.35/bin/apache-tomcat-8.5.35.tar.gz

tar -xzf apache-tomcat-8.5.35.tar.gz
</code></pre>

<h2>Tomcat的启动 / 关闭</h2>
<p>Tomcat的bin目录下执行：</p>
<pre><code>./startup.sh    启动

./shutdown.sh   关闭
</code></pre>

<h2>wget  下载命令</h2>
<p>用于根据URL地址直接下载文件到服务器。</p>
<p>如：</p>
<pre><code>wget http://mirrors.shu.edu.cn/apache/tomcat/tomcat-8/v8.5.35/bin/apache-tomcat-8.5.35.tar.gz

wget http://doc.tedu.cn/resource/apache-tomcat-8.0.50.zip
</code></pre>

<h2>CentOS 防火墙命令</h2>
<p>开放端口：在运行tomcat的服务器上执行开放防火墙端口的命令</p>
<pre><code>firewall-cmd --permanent --add-port=8080/tcp
</code></pre>

<p>重启防火墙：</p>
<pre><code>firewall-cmd --reload
</code></pre>

<p>查看开放的端口号：</p>
<pre><code>firewall-cmd --list-all
</code></pre>

<h1>安装MySQL</h1>
<p>yum 安装</p>
<pre><code>yum install mariadb   -y

yum install mariadb-server  -y
</code></pre>

<p>启动mysql</p>
<pre><code>systemctl start mariadb.service
</code></pre>

<p>设置UTF-8支持中文编码：</p>
<ol>
<li>
<p>测试：使用mysql客户端登录，执行：</p>
<pre><code>show variables like 'char%';

+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | latin1                     |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | latin1                     |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
</code></pre>

</li>
<li>
<p>修改文件 /etc/my.cnf，添加：</p>
<pre><code>[mysqld]

character_set_server=utf8
</code></pre>

</li>
<li>
<p>重启mysql</p>
<pre><code>systemctl restart mariadb.service
</code></pre>

</li>
<li>
<p>再次登录mysql</p>
<pre><code>show variables like 'char%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
</code></pre>

</li>
</ol>

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